Key Frame Glitch?

OminousAutumn

I read other threads from 2014-2019 and was wondering if there is a fix yet?

i have finished my animation and it's great. Time to simulate, but now i can't add a key frame for the Y value of my model. I need them to start in the air at 0 and end in a laying position at 30. When I add a key frame and change the values, it automatically deletes itself when the timeline marker changes frames. Bug? Am I doing something wrong? 
 

it worked at the start with my initial 0-30 sim. Then I keyframed 30-159 and now I can't keyframe Y before 30. 

InfernusIntraMe

Welcome to hell. Sometimes you will find that a selection will not bring up the actual selection on the timeline or graph. Usually closing and reloading fixes this. Sometimes, you will have to enable all properties to be visible via the "hamburger" icon in the top right corner of the timeline with the "play button" icon. This is just one of them situations where you haven't sacrificed enough time tweaking for 16 hours straight for 3 years. Lock in.